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Hot tubs are usually heated using an electric or natural gas heater, though there are also submersible wood fire hot tub heaters, as well as solar hot water systems. Hot tubs are also found at natural hot springs ; in this case, the water may be dangerously hot and must be combined with cool water for a safe soaking temperature.
The water will need to be drained periodically and can be reused to water plants if hydrogen peroxide is used. Metal stock tanks have also been used as a cheap alternative for a hot tub. Various heating methods are possible, including use of a propane heater or submersible wood stove. [7]
Solar heat is clean and renewable. This is the most modern system. Increasingly, solar powered water heaters are being used. Their solar thermal collectors are installed outside dwellings, typically on the roof or walls or nearby, and the potable hot water storage tank is typically a pre-existing or new conventional water heater, or a water heater specifically designed for solar thermal.
Such water heaters are often fitted with an auxiliary electrical immersion heater for use if the boiler is out of action for a time. Heat from the space-heating boiler is transferred to the water heater vessel/container by means of a heat exchanger, and the boiler operates at a higher temperature than the potable hot water supply. Most potable ...
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The water is hot, usually about 38 to 42 °C (100 to 108 °F). A modern furo may be made of acrylic, and the top of the range models fitted with a re-circulation system (oidaki) which filters and re-heats the water. This system is connected with the hot water heater, either gas/propane fired or electric/heat pump types.